package com.sky.aspect;

//自定义切面，实现公共字段自动填充

import com.sky.annotaion.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Slf4j
//容器管理
@Component
public class AutofillAspect {
    //切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotaion.AutoFill)")
    public void AutofillAspectCut() {}

    //定义通知
    //进行前置通知
    @Before("AutofillAspectCut()")
    public void Autofill(JoinPoint joinPoint) {
        log.info("开始公共字段自动填充");
        //获取当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象

        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取注解对象
        OperationType operationType = autoFill.value();//获取数据库操作类型

        //获取当前被拦截的方法参数==实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null && args.length == 0)
        {
            return;
        }

        //获取实体对象
        Object entity = args[0];

        //准备赋值数据
        LocalDateTime localDateTime = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据不同的数据库操作类型，为实体对象赋值
        if (operationType == OperationType.INSERT)
        {

            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);



                setCreateTime.invoke(entity,localDateTime);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,localDateTime);
                setUpdateUser.invoke(entity,currentId);



            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        }else if(operationType == OperationType.UPDATE)
        {
            try {
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            setUpdateTime.invoke(entity,localDateTime);
            setUpdateUser.invoke(entity,currentId);
            }
            catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }
}
